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Making global color corrections

From: Scanning with SilverFast

Video: Making global color corrections

In this video, I'd like to show you some of the Global Color Correction tools that we haven't really looked at or learned yet. Earlier in the course, we spent a lot of time working on histograms and gradations which are very powerful tools particularly when we use them in combination with the Densitometer which we're also going to use here. I am going to show you how to make some more intuitive color adjustments, but also make them semi-quantitative along the way. We've got two images here, let's start with this one here. We've created two scan frames, and we're going to start with image number one, and I am just going to magnify that, so that we can see what we're doing here.

Making global color corrections

In this video, I'd like to show you some of the Global Color Correction tools that we haven't really looked at or learned yet. Earlier in the course, we spent a lot of time working on histograms and gradations which are very powerful tools particularly when we use them in combination with the Densitometer which we're also going to use here. I am going to show you how to make some more intuitive color adjustments, but also make them semi-quantitative along the way. We've got two images here, let's start with this one here. We've created two scan frames, and we're going to start with image number one, and I am just going to magnify that, so that we can see what we're doing here.

I have gone ahead and taken the liberty of putting the color sampler point on here, so we can see what we've got. And notice we've got Red, Green, and Blue, and if you remember from our earlier discussions, Red should be greater than Green should be greater than Blue, so it is here. So we've got some human-looking skin. You can also see by looking at the image that there is a bit of a red yellow color cast because this image was taken with incandescent light. And true enough, we can use the Histogram and particularly the Gradation, the Curve tool to come in here and adjust this. But there are some easier things that we can do and one of them is using the Global Color Correction tool.

Along the way, we're also going to use this Picture Settings tool, and I am going to set up this Picture Settings tool like this where you just click there in that little tickbox and you can choose Separate. And what this allows you to do, even if I don't use this as an adjustment tool, I love to use it as a monitoring tool, it shows you a dynamic distribution of tonal values on all three channels when you choose Separate here. So I am looking at my RGB and I'd love to get the Red here down below to 200, that's for sure. Notice that it's pretty rich in Red and Green, a little bit low in Blue because Blue is down there at 124.

So what we can do is, just looking at the color circle here, we can just move this little black dot away from the Red and Yellow, and a little bit more towards the Blue. And you'll notice that as we do this, the Red begins to drop, and we can move it towards the Green or we can move it towards the Purple if we want, and notice that it's a nice subtle improvement in the overall skin-tone by doing that. And at the same time, what we're watching for here, it's very easy to go overboard with this dialog box, which is why I like to actually monitor the values here and also watch the histograms, because it's very easy to get these big spikes right at the end.

Notice we've got daylight on this end, and we've got daylight on this end here just barely on the Red end. We wouldn't want to move too much further away. By the way, another subtle adjustment you can do with this tool or any of the Saturation tools we just used the one here, is you can just desaturate the image just a little bit, say, -10, and notice that takes out some of the harsh Red-Yellow as well. Sometimes, that's all you need to do. So there's a semi-quantitative way with a little bit more intuitive color-based Global Color Correction. Okay, so let's go ahead and zoom back down here.

I am going to leave up my Densitometer and leave up my Picture Settings, and I want to activate this particular frame here. And let's go ahead and magnify that and talk a little bit about Global Color Correction for this one, and let's indeed bring up the Global Color Correction tool, and in this particular case, we've got a sunset. And once again, we can bring up our Picture Settings, so we can kind of monitor what happens to our RGB channels. And if we wanted to reduce or increase the amount of color that we had like in in this particular sunrise, once again, we can desaturate the picture if we want to, take out some of that, or we can actually increase the Saturation of the picture.

But notice that if you move too far, and it's very easy to go too far with this, you end up piling all these red data up against here, and this will never print and look like this. We're way out of gamut with our colors. So my suggestion is to be very subtle with these tools, a little bit goes a very long way. So we can watch our Histogram, maybe we could bump it up that much, and we could probably print this on a high dynamic range, 8-color inkjet printer. It would never print in commercial prepress. Or if we wanted to decrease, we can just go to do a little bit of desaturation of that.

And once again, we can do the same kind of adjustment. We can move that away from the high reds and oranges and a little bit more towards the blue if we want to make it a little bit more subtle. So you move away from the color that you're trying to avoid, and towards the colors that like you add a little bit more on, and you can use your Densitometer as we've seen, which was great for the skin tone because we know what those are supposed to be. And certainly, you use your Histogram so you don't lose color values from having high spikes on either highlight or the shadow end. So there is using the Global Color Correction tool along with Picture Settings and Densitometer to help make some global color corrections.

Show transcript

This video is part of

Image for Scanning with SilverFast
Scanning with SilverFast

52 video lessons · 4301 viewers

Taz Tally
Author

 
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  1. 5m 19s
    1. Welcome
      58s
    2. What you should know before watching this course
      43s
    3. Taking the Tazmanian Oath
      3m 38s
  2. 19m 14s
    1. Launching SilverFast
      4m 2s
    2. Touring the SilverFast interface
      3m 35s
    3. Understanding SilverFast's scanning workflows
      4m 28s
    4. Using automated vs. manual scanning
      4m 31s
    5. Getting help as you use SilverFast
      2m 38s
  3. 32m 46s
    1. Touring the SilverFast 8 automatic scanning tools
      6m 7s
    2. Preparing for automatic scanning
      4m 6s
    3. Arranging your workspace
      4m 23s
    4. Setting up color management
      4m 43s
    5. Setting scan frame and resolution
      3m 55s
    6. Adjusting, naming, formatting, and locating an image
      8m 24s
    7. Previewing scan settings with the info tool
      1m 8s
  4. 1h 7m
    1. Scanning simple line art
      8m 6s
    2. Scanning detailed line art
      8m 9s
    3. Scanning grayscale photos
      11m 43s
    4. Scanning color photos
      11m 17s
    5. Scanning a color photo as a grayscale image
      12m 15s
    6. Scanning a positive piece of film
      6m 52s
    7. Scanning a negative piece of film
      8m 39s
  5. 26m 1s
    1. Touring the manual scanning tools
      7m 19s
    2. Setting preferences for manual scanning
      10m 0s
    3. Calibrating your scanner
      3m 40s
    4. Arranging your workspace
      5m 2s
  6. 1h 35m
    1. Scanning simple line art and changing it into vectors
      7m 38s
    2. Scanning simple line art and keeping it as pixels
      5m 41s
    3. Scanning detailed line art
      8m 18s
    4. Scanning grayscale photos
      14m 5s
    5. Scanning landscape color photos
      15m 51s
    6. Scanning color portrait photos
      13m 56s
    7. Scanning color product shots
      9m 29s
    8. Scanning a color photo as a grayscale image
      4m 31s
    9. Scanning a piece of positive color film
      5m 52s
    10. Scanning a piece of negative color film
      9m 56s
  7. 1h 0m
    1. Should I use SilverFast or Photoshop?
      4m 9s
    2. Making global color corrections
      4m 37s
    3. Bringing out shadow details
      4m 28s
    4. Making a selective color replacement
      3m 21s
    5. Sharpening in SilverFast
      7m 15s
    6. Working with target-based corrections
      4m 55s
    7. Color correcting with neutrals
      10m 19s
    8. Exploring automatic color correction in manual mode
      3m 35s
    9. Scanning a printed image
      5m 49s
    10. High-bit-depth and HDR scanning
      5m 28s
    11. Removing noise and patterns
      3m 32s
    12. Removing dust and scratches
      3m 30s
  8. 7m 2s
    1. Batch scanning images
      1m 28s
    2. Using the JobManager
      4m 16s
    3. Exploring SilverFast 8 shortcuts and tips
      1m 18s
  9. 1m 29s
    1. Goodbye
      1m 29s

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